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Old 02-04-2015, 07:06 PM
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Hemi using oil...?

hello everyone, I'm new to the forum my name is Jared. I have a 2005 Grand Cherokee Limited with the 5.7L and I bought it used with 107,000 miles.

I'm mechanically inclined so you guys/gals can go ahead with automotive terms. When I bought my Jeep, I took it home and first thing I did was check all the fluids (probably should've done that before I bought it) and everything was good except the oil level. I pulled the dipstick and checked it 3 times and there was absolutely no oil on it.
I did an oil change with full synthetic and the level is in between the cross hatches.
After about 2000 miles, the oil level was all the way down to the MINIMUM oil level line. After 3500 miles, I decided to change the oil using full synthetic again and when I checked it, the level was at the very very end of the dipstick.
I replaced the PCV valve, I don't see any signs of oil leakage except for some grimy oil cooler lines behind the radiator.
There is no smoke, no oil smell from the exhaust, etc. What I don't understand is where the oil consumption is coming from?

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  #2  
Old 02-04-2015, 07:13 PM
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How much are you filling it up with? 7 quarts?
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Old 02-04-2015, 07:35 PM
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Re: Hemi using oil...?

yep, 7 quarts of 5w20
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Old 02-05-2015, 05:19 PM
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Re: Hemi using oil...?

Mine takes 7.5 qts. to put it right on the full mark. My Hemi LX takes only 7 qts. The 4WD oil pan is a little different.

Have you checked the back side of the throttle body butterfly for the caked on crap. Do you have a catch can on it? If not, that should be you next order of business. Some of the Hemi's do use a little oil though. If the vehicle was previously owned by grannies and had nothing but dino. oil in it for 107K, you may have some internal contamination that is causing the rings to stick....not making good contact with the cylinder walls. I guess it's possible that the valve seals could be bad too. They shouldn't be bad though. I changed the valve seals on both my Hemi vehicles when I changed the cams and valvetrain.....one at ~65K and the other at ~50K and both were like new. I've been running synthetic in both forever though.

If you're throttle body is really contaminated, you may want to try some combustion tract cleaner to see if that helps at all. I will say that I am not a believer in the stuff, but since this is a "new to you" vehicle it may be worth a try. Just be aware that any contaminants released will be cycled through the whole combustion tract and out the exhaust, possibly contaminating the O2 Sensors and/or the catalytic converters, depending of course how much stuff is released.

Keep us posted on your actions and results.
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Old 02-05-2015, 06:17 PM
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Re: Hemi using oil...?

The above advice is all very good, and my hemi is the same 7.5qts to full.

The grimy oil cooler lines you are seeing are likely the transmission cooler lines (they are known to leak at the metal crimp as it enters the cooler).
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Old 02-05-2015, 06:19 PM
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Quote:
Originally Posted by dr.lee.baugh View Post
The above advice is all very good, and my hemi is the same 7.5qts to full.

The grimy oil cooler lines you are seeing are likely the transmission cooler lines (they are known to leak at the metal crimp as it enters the cooler).
That they do. Mine leak on my 2005 hemi. Any idea cost to replace?
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Old 02-05-2015, 06:22 PM
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Re: Hemi using oil...?

Depending on shop rates, anywhere from $150 to $300 I would think. I can't remember the cost when I had mine done. It's a finicky job that can take a lot of time to wind the metal portion of the lines through to the cooler. The parts are cheap.
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Old 02-05-2015, 09:14 PM
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Re: Hemi using oil...?

Quote:
Originally Posted by Sleeps View Post
That they do. Mine leak on my 2005 hemi. Any idea cost to replace?
Some folks have chosen to cut the hoses off and replace them with oil resistant hose and hose clamps. I haven't heard of any that have had problems by doing it this way. Cost.....maybe $10.

I removed my lines (a real PITA) and took them to my local hydraulic repair shop and had new hoses put on. Cost was about $15. By the way, putting them back in is a bigger PITA than taking them out but, IMO, in the end the savings was worth it.

I guess it's whatever you're comfortable with is the way to go. I know for sure I wouldn't pay $200-300+ to have someone do the job.
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Old 02-05-2015, 10:15 PM
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Quote:
Originally Posted by jeepgcoman View Post

Some folks have chosen to cut the hoses off and replace them with oil resistant hose and hose clamps. I haven't heard of any that have had problems by doing it this way. Cost.....maybe $10.

I removed my lines (a real PITA) and took them to my local hydraulic repair shop and had new hoses put on. Cost was about $15. By the way, putting them back in is a bigger PITA than taking them out but, IMO, in the end the savings was worth it.

I guess it's whatever you're comfortable with is the way to go. I know for sure I wouldn't pay $200-300+ to have someone do the job.
Ill look into it. I rather do it myself than get robbed by some random dude who doesn't love my jeep like i do.

So basically drain tranny and remove the lines then replace them with new ones and put it back together?
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Old 02-06-2015, 06:41 AM
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Re: Hemi using oil...?

Quote:
Originally Posted by Sleeps View Post
Ill look into it. I rather do it myself than get robbed by some random dude who doesn't love my jeep like i do.

So basically drain tranny and remove the lines then replace them with new ones and put it back together?
Should not be necessary to drain the tranny, only the fluid from the oil cooler and lines will flow out.
I had quite some oil sonsumption on my 4.7 (different engine i know, but the basics are the same). I didnīt see any smoke while accelerating or cruising, but after slowing down and first moment of throttle opening (or prolonged idling),it was blowing a puff of smoke. It where the valve stem seals. Bad inlet valve stem seals let the oil pass by when the highest vacuum is present, so with throttle blade closed. As soon as the throttle is opened a bit, the higher airflow will suck the oil into the cylinders and burn it of. There was a slight black coating in the exhaust tip, but really slight, while it was burning more then 1 ltr per 1000 km.
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Old 02-06-2015, 07:59 PM
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Re: Hemi using oil...?

Quote:
Originally Posted by Frango100 View Post
Should not be necessary to drain the tranny, only the fluid from the oil cooler and lines will flow out.
I had quite some oil sonsumption on my 4.7 (different engine i know, but the basics are the same). I didnīt see any smoke while accelerating or cruising, but after slowing down and first moment of throttle opening (or prolonged idling),it was blowing a puff of smoke. It where the valve stem seals. Bad inlet valve stem seals let the oil pass by when the highest vacuum is present, so with throttle blade closed. As soon as the throttle is opened a bit, the higher airflow will suck the oil into the cylinders and burn it of. There was a slight black coating in the exhaust tip, but really slight, while it was burning more then 1 ltr per 1000 km.
Right on, Frank. How many miles were on yours when your valve seals went out? Does the 4.7 have the cone/umbrella type seals?
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Old 02-06-2015, 10:42 PM
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Re: Hemi using oil...?

I changed the seals at 170K km. The seals on the 4.7 are in the form of a hat, where the lower metal ring of the seal forms the lower spring seat. What a job was that, especially the two aft cylinders, which are somewhat hidden under the cowl.
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